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What percent of 3.8 is 38?

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klobas | eNotes Newbie

Posted January 13, 2009 at 11:45 PM via web

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What percent of 3.8 is 38?

Tagged with math, percentages

3 Answers | Add Yours

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enotechris | College Teacher | (Level 2) Senior Educator

Posted January 13, 2009 at 11:52 PM (Answer #1)

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If 3.8 represents 100%, 38 represents ten times that amount, or 1000%.  A general method of solving these kinds of problems is to set up a ratio.  Three point eight is to a hundred as 38 is to x, and solve for the unknown:

1)  3.8/100 = 38/x

2)  3800 = 3.8x

3)  1000 = x

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kborgeson | Middle School Teacher | (Level 2) Adjunct Educator

Posted March 13, 2009 at 10:37 AM (Answer #2)

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With percent questions the best way to do it is to use the formula %/100 = is/of.  I teach my students this and it works every time.

Your question "What percent of 3.8 is 38?" will fit right into the formula.  % is the unknown, so it goes in the formula as xOf is the number 3.8, and is will be 38.  Fill these into the formula, cross multiply and solve for x.

x/100 = 38/3.8 (cross multipy)

3.8x = 3800 (divide both sides by 3.8 to get x alone)

3.8x/3.8 = 3800/3.8

x = 1000%

This makes sence because 3.8 is much smaller than 38, so it makes sence that 38 is 1000% higher than 3.8.  Hope this helps.  :)

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revolution | College Teacher | Valedictorian

Posted July 18, 2010 at 11:15 PM (Answer #3)

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percentage= worked-out value/ used value * 100%

=38/3.8x100%

= 10 x 100%

= 1000%

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